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    <title>css学习</title>
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        <p class="p1">HTML5+CSS3</p>
        <span class="sp">
            <span class="s1">缤</span>
            <span class="s2">纷</span>
            <span class="s3">夏</span>
            <span class="s4">衣</span>
        </span>
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